Drum



E. W. FOGAL.

DRUM.

PPPPP CATION F l L E D M A Y 2 8 1920. I 1,403,021,, Patented Jan.10,1922. I bunhm I llllnllllllllllllllll Mil/.21 7 W fifty;

JOHN E. W. FOGAL, OF QUINCY, ILLINOIS.

rarest ent ies.

. DRUM.

Application filed May 28,

To all 1071 0721 may concern.

Be it known that 1, JOHN E. W. FooaL, a citizen of the United Hates, and a resident of Quincy, in the county of Adams and State of Illinois, have inven ed a new and useful Improvement in Drum, of which the following is a full, clear, and exact description.

My invention relates to improvements in drums, and it consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide a drum which is so constriu ted as to cause its lead to be moved slowly at the start, the speed of travel. being gradually accelerated to attain a uniform maximum speed and then gradually decelerated to a dead stop, the drum being rotated at a uniform speed dur ing the entire time.

A further object of my invention is to provide a device of the type described that ls particularly adapted to operating elevator ga es and the like, but which can be operatively coupled to any load that is to be 'aised or lowered slowly at the start, then uniformly and more apidly and finally moved with decreasing speed to a stop, thereby pre venting the load being brought to an abrupt stop.

.3. further object of my invention is to provide a drum of the type described which is strong and durable in construction, not likely to get out of order easily, and thoroughly practical commercially.

Other objects and advantages will appear in the following specification and the novel lcatures of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings, fori'ning part of this application, in which Fig. 1 is a side elevation of the device showing its position and arrangement of the cable thcrcon before a load has been lifted, a portion of the device being broken away.

Fig. 2 is an edge view of the device showing its position and arrangement of the cable thereon when its load has been lifted.

In carrying out my invention, I provide a shaft 1 which is adapted for operative connection with any suitable source of power (not shown). Upon the shaft 1 I mount a drum having a substantially cylindrical central portion 2 and side portions 4 and 5. The side portions 1 and 5 are formed integrally with the central portion 2 in the form Specification of Letters Eater/t.

Patented Jan. 16*, 19223. 1920. Serial No. 384,927.

of the device shown in the drawings but may be formed of separate component portions secured together as hereinafter described. It will be observed that the side portions a and 5 aredisposed eccentrically with respect to the axis of the central portion 2. The drum is rigidly secured to the shaft 1 in any suitable manner, as by means of a key 3. The side portions 4 and 5 are provided with peripheral flanges (S and 7, which are preferably formed integrallytherewith.

A continuous spiral groove 8 is provided in the peripheral surface of the central portion 52, as shown in the drawings. t is to he noted that a piral groove 9, which is provided in the peripheral surface of the side portion a, continues into the spiral groove 8'wl1ile the spiral groove 8 continues into and terminates in a spiral groove 10, which is formed in the peripheral surface of the side portion 5, thus forming a con tinuous spiral guideway adapted to receive a cable 11.

One end of the cable 11 is inserted through a radiallyextending opening 12 which leads inwardly from a point in the peripheral edge of the side portion as best seen in Fig. 1. A transverse opening 13 communicates with the radially extending opening 12. A clamping member 14: is secured by means of stud bolts 15 or the like within the recess 13, thereby clamping the end of the cable 11 against the wall of the recess and maintaining the same in position.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. The shaft 1 operated to rotate the drum in the direction indicated by the arrow in Fig. 1. The cable 11 departs from the groove 9 at the point 4, the other end of the cable being secured to a load (not shown). It will of course be understood that the cable 11 may be conducted through suitable guidingpulleys (not shown) to the load. The rotation of the shaft and the consequent rotation of the drum causes the cable 11 to be wound upon the side portion 4c, the central portion 2, and the side portion 5 in the order named. During the time the cable 11 is being received within that portion of the groove 9 lying between the points :0 and 3 (see Fig. 1), the speed of movement of the load will be gradually increased until a maximum is attained when the cable 11 reaches the point The speed will then remain constant during the time the cable is being Wound upon the central portion 2. When the cable reaches that point in the groove 10 indicated by a, the speed of movement of the load will gradually be decelerated until the cable reaches the point I) when the movement will cease and the load will come to a stop. Ob'

viously, when the cable 11 is being unwound from the side portion 5, the central portion 2 and the side portion 4, in the order named, the operation to lower the load will be precisely identical with that described; that is to say, the load will be started slowly, the speed of travel will gradually increase to a maximum'whieh will be maintained for a period and the speed will then be decreased until the movement is stopped. It is to be noted that the drum has been rotated at a uniform speed throughout. 7

It is to be understood that I may form the device by providing two precisely identical half portions thereof, one of the half portions consisting of the eccentric side portion 4 and one-half of the cylindrical central portion 2. The other half portion will consist of the remaining half ofthe cylindrical portion 2 and the eccentric side portion 5. The half portions of the device are fastened rigidly together in an ordinary manner. The outermost point on the peripheral edge of one of the side portions would normally be positioned at a point di ametrically opposite the outermost point on the peripheral edge of the other of the side portions. The length of travel of the cable on either one of the half portions of the device may be varied and the total height of the lift thus regulated by securing the half portions of the device together in such a position as tochange the positions of the eccentric side portions 4 and 5 with respect to each other. That is to say, the outermost point on the peripheral edge of either of eccentric side portions 4: or 5 may be positioned in alinement with any point in the arc of the .circle described by the cylindrical central portion 2. Consequently the outermost points on the peripheral edges of the eccentric side portions, either or both, may be moved arcuately out of diametrically opposed positions to approach or recede from each other, thus permitting the height of the lift to be varied without changing the dimensions or size of the drum.

An advantage obtained when my improved drum is used lies in the fact that a load is not started with a jerk nor brought said parts consisting or" a relatively large cylindrical portion and a diametrically smaller portion merging into the relatively large cylindrical portion and located eccentrically with respect thereto, said relatively large cylindrical portions being secured together in co-axial alinement, and each or" said parts being formed with a groove in its peripheral wall, said grooves being relatively arranged to provide a continuous guideway adapted toreceive a cable.

2. A device of the character described comprising two precisely identical halt sections, each consisting of a relatively large cylindrical portion and a diametrically smaller portion merging into the relatively large portion and located eccentrically with respect to the latter, each of said parts being formed with a groove in its peripheral wall, said groove being arranged to describe convolutions extending from acpoint near the end wall of the smaller portion to the end wall of the larger portion, said relatively large cylindrical portions being secured together in co-axial alinement to occasion the registration of the adjacent ends of the said grooves and to position the axes of the relatively small portions at diametrically opposed points.

3. A drum adapted to rotate about its central axis and consisting of a relatively large cylindrical portion and diametrically smaller portions located at opposite ends of the relatively large cylindrical portion, each of said smaller portions being located with its peripheral wall alined at one point with the peripheral wall of the relatively large portion, and with its axis at a point diametrically opposed to the axis of the other smaller portion, said drum being formed with a cable-receiving groove in its peripheral surface beginning in an annular groove adjacent to one end thereof and terminating in an annular groove adjacent to its opposite end, said cable-receiving groove being arranged to extend completely around the periphery of the drum a plurality oi? times between the annular grooves.

JOHN E. W. FOGAL. 

